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| Joined: | 03-14-2005 |
| Location: | Atlanta, Georgia USA |
| Posts: | 406 |
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The only thing I'd add is what Garry Kemp pointed out to me years ago, and that was the early 907 intake ports are fairly tiny. I posted a photo comparing early and later castings at:
http://shorpac.com/v-web/gallery/album08/907Intake_comparison
Esprit intake ports are even larger...but they're pushing 300hp.
If someone goes to the trouble (and expense) of bolting on cams and Dellorto's, I would always recommend an "Improved Touring" legal porting job. This type of porting job is more appropriately referred to "gasket matching".
In the case of the 907, the runners are fairly short and "legally" matching the head runners to the intake manifold 1" in either direction can really help those bigger cams and carbs bring the engine to life.
This type of "porting job" isn't very aggressive and generally does not cause the low-end losses common with "full blown" porting jobs (it also won't net you 40hp like one of Richard's jobs either). As a compromise solution it's something I suggest because it's fairly easy and inexpensive for almost any machinist to do.
Judson